92 Civic HB

So I have a 92 civic hatchback that I bought with a B18C1 (gsr) engine and a P28 ecu. Which catylitic converter should I use and where do I connect the wires for the o2 sensor! Thanks in advance for any help!

Get, at least, the cat that was made for that engine. You should have a 4 wire connector for the o2 sensor. You don't have one at all on it now???
Actually you may not have a 4 wire connector for the o2, depending on what harness the person before you used. Either way, look for the connector without anything on it. Location depends on what harness is in the car.